When estimating the mean of a population, how large a sample is required in order that 96% error margin be $\frac{1}{20}$ of the population standard deviation?

Name: When estimating the mean of a population, how large a sample is required in order that 96% error margin be $ \frac{1}{20} $ of the population standard deviation?
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When estimating the mean of a population, how large a sample is required in order that 96% error margin be  $ \frac{1}{20} $ of the population standard deviation?

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The Answer of When estimating the mean of a population, how large a sample is required in order that 96% error margin be  $ \frac{1}{20} $ of the population standard deviation?

When Estimating the Mean of a Population, How Large a Sample